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The Composition of the Bulge Globular Cluster NGC 6273

Published online by Cambridge University Press:  31 March 2017

C. A. Pilachowski ,
C. I. Johnson ,
R. M. Rich ,
N. Caldwell ,
M. Mateo ,
J. I. Bailey III  and
J. D. Crane
C. A. Pilachowski
Affiliation:
Indiana University Bloomington, Department of Astronomy SW319, 727 E 3rd St., Bloomington, IN 47405USA email: cpilacho@indiana.edu
C. I. Johnson
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St. MS-15, Cambridge, MA 02138USA email: cjohnson@cfa.harvard.edu
R. M. Rich
Affiliation:
University of California at Los Angeles
N. Caldwell
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St. MS-15, Cambridge, MA 02138USA email: cjohnson@cfa.harvard.edu
M. Mateo
Affiliation:
University of Michigan at Ann Arbor
J. I. Bailey III
Affiliation:
University of Michigan at Ann Arbor
J. D. Crane
Affiliation:
The Observatories of the Carnegie Institution of Washington
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Abstract

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Observations of red giants in the Bulge globular cluster NGC 6273 with the Michigan/Magellan Fiber System (M2FS) mounted on the Nasmuth-East port of the Magellan-Clay 6.5-m telescope at the Las Campanas Observatory reveal a spread in metallicity. Members have been confirmed with radial velocity. NGC 6273 has at least two populations separated by 0.2-0.3 dex in [Fe/H]. The sodium and aluminum abundances are correlated while the magnesium and aluminum abundances are anti-correlated. The cluster also shows a rise in the abundance of the s-process element lanthanum with [Fe/H] similar to other massive clusters. The cluster contains a possible third population depleted in most elements by 0.3 dex.

Keywords

globular clusters: individual (NGC 6273)stars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 341 - 342
Copyright
Copyright © International Astronomical Union 2017 

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